Dear WWM crew First I want to thank you for the dedication and willingness to help fellow aquarists, I’ve been enjoying and learning through this website and the books you write/reference for the last couple years, helping me enjoy and learn through this aquarium experience, your efforts are greatly appreciated. I have a FOWLR tank that has been up for 2 years and now starting to migrate to a reef setup (i.e. adding Light, Calcium, Corals and Clams!). Tank Size 75Gallon 3″ aragonite substrate 120 lb of LR Filter: Eheim 2215 Canister – cleaned and replaced pads today (including Active Carbon) Calcium: Knop S-IV reactor (Knop coarse media). 1 CO2 bubble every 4 seconds and 2 drops of affluent into the main tank every 3 seconds. Affluent: PH 7.1 / KH 26 (I’ll increase the CO2 to 3 bubbles per second to lower the PH to 6.5 – 6.8) Skimmer: Tunze 3115 generating 1 cup of semi-dar